Since either of these can OHKO the new OU Garchomp after entry hazards. Which of these would continue to be more beneficial to have in general?
My team
Subpunch Breloom
physical defensive Fortress
Cleric Blissey
Choice Band Azumarill
Choice Specs Rotom-H

I'd say Mamoswine. He can take more hits, has awesome dual STABs, is not weak to SR, he can set up rocks, he can break Subs with Icicle Crash, has more Attack than Weavile, and there's a reason that he's OU and not Weavile ;D

both weavile and mamo gets screwed if chomp gas rough skin which is always since you wouldn't use either in Ubers. you would need a Special Attacker with Ice Beam, a focus sash and a Priority move to finish it off.